In this experiment, free shipping was a/b tested against free shipping with a 40€ purchase or higher. Hence, in the variation, customers needed reach cart amount to earn the free shipping eligibility. 

In this experiment, the variation remembered and prefilled user's size choices for the duration of the session. The control version always started with a fixed product size value (ex: XS). The variation prefilled them between products or screen refreshes. Impact on sales was measured.

In this experiment, product color swatches were replaced with real product photos. Whereas the control showed the colors as more abstract circles. Impact on sales was measured.

In this product detail page experiment, a number of reassurances were brought out visually in a lined or bulleted way. The 4 reassurances included: free shipping and returns; Made in Germany, 90 Day Returns; and Buy With Invoice (popular in Germany). Impact on revenue per user was measured. The control contained very feint copy (smaller and more subtle) about free shipping.

In this product detail page experiment, reassurances under the add-to-cart button were rearranged. The control contained copy about: free shipping and free returns formatted as two gray boxes, with a variety of payment methods and their corresponding logos underneath.

The variation used a more convention bulleted, line-by-line format. It also contained free shipping and returns, but also elaborated with "100 day returns", an "anti-hole guarantee", and "purchase with invoice" (perhaps more popular in Germany?). Impact on sales was measured.

In this listing page experiment, color sets of the same product were tested against individual products with unique colors (with additional product tiles). Essentially, the A version here contained fewer product items (with color sets), while the B version contained more results and tiles (with grouped products). Impact on total sales was measured.

(The original control and variation was inverted, but was flipped to match the fewer or more results pattern).

In this experiment, bestselling product colors were highlighted with a bestseller badge on product listing and product detail pages.

In this experiment, a floating add-to-cart with two product choices (color and size) were added on a product page. This appeared only after scrolling past the existing / embedded product selection buy box.

The floating add-to-cart widget had another layer of complexity in that it allowed customers to make a size and color selection with an expandable fly out. Making a selection would also append the total price to the add-to-cart button label.

Impact on total transactions was measured.

In this experiment, a floating sticky bar was added on product pages. The sticky elements only appeared after users scrolled beyond the fixed buy box  area that is relatively high on the page (visible on the control screenshot). The sticky bar contained three elements: a button to configure up to three product choices, a flavor selection pulldown, and the add-to-cart button. 

In the variation, when users clicked on the flavor pulldown three things happened. First, they were anchored back to the top of the buy box. Second, the floating sticky disappeared. And third, the flavors pulldown automatically expanded (overlapping the original primary add-to-cart button).

The control did not have any of the sticky behaviors.

Impact to total sales was measured.

In this experiment, search functionality was added in the variation, globally on mobile. Impact on sales was measured

Upon clicking the Add-To-Cart button, the button label changed to a cheering message which congratulated the user on his choice and ensuring that shipping is free. Translation: "Good choice. Your shipping and returns are free."

Here is an experiment with an added "price per pair" in the context of products with multiple items (packs).A high contrast badge-like copy was appended underneath the price which translates to "only $X per item". Impact on sales was measured.

In this experiment on a product screen, a message about quality (from the founders) was reformatted to reinforce the "Anti Hole Guarantee" (in the context of socks). The founders were also made more prominent and their signature added as well. Interestingly, the actual guarantee copy (and its important detail about a 6 month product replacement) was present further down on both the control and variation.

The translation of the new copy (Google Translate) reads:

Since we founded SNOCKS, the quality and comfort of our products have always been our top priority. Why? When we both were still studying, we didn't have the money to buy new socks & underpants every 1-2 months. That's why it was clear to us from the start that we wanted to sell quality products that are also extremely comfortable. And just in case something goes wrong, we have decided to introduce an anti-hole guarantee.

In this experiment a "Free Shipping & Returns" message was added just below the price information. 

This experiment replaced a visible coupon field with a dynamic text link that would initially hide the form field. Only after clicking the text link would the coupon form field appear. The translation from German is "Do you have a coupon code? Click here to apply". Impact on completed transactions was measured.

In this experiment, the variation has a "Back To Shopping Cart" link right underneath the checkout button. Impact on sales was measured.